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Hebrew Calendar vs MailCheck.ai

Same instrument, two spec sheets — measured, not claimed.

APIHebrew CalendarNEW—MailCheck.aiNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublished5 req/window · 4 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Hebrew Calendar vs MailCheck.ai: common questions

Which is more reliable, Hebrew Calendar or MailCheck.ai?

On our scheduled checks, MailCheck.ai leads on measured uptime — Hebrew Calendar at —% versus MailCheck.ai at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Hebrew Calendar and MailCheck.ai need an API key?

Neither needs a paid key — Hebrew Calendar is callable with no signup, and MailCheck.ai is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Hebrew Calendar and MailCheck.ai from the browser?

Yes — both Hebrew Calendar and MailCheck.ai send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Hebrew Calendar and MailCheck.ai free for commercial use?

Hebrew Calendar has unclear commercial terms, and MailCheck.ai has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.